Google Webmaster Tools shows: Your site has no hreflang tags. How can I solve this?

Your site has no hreflang tags. How can I solve this?As all the changes have an influence on your website and the webmastertools, Google will need to crawl and index the changes first before the results will be shown in your Google Webmastertools.
The Google spiders crawl your store to rebuild their index.

After they have crawled your store again, the changes will be visible in the Google Webmastertools. The frequency of the crawls is based on many factors such as Pagerank & links.